Research On The Deformation Of Unsupported Islands In The Light-curing Additive Manufacturing Process

The Stereo Lithography Additive Manufacturing was born in the late 80s of last century,in recent years in the promotion of intelligent manufacturing and industrial 4.0 background,it has become one of the most noteworthy industrial technologies in global commercial manufacturing.This technology is a kind of forming method with widely used,mature process,rapid development and in-depth research,especially applied to samples prototyping and functional testing,it can shorten development time and improve market competitiveness.However,the accuracy of the sample made with this technology has been difficult to improve,the whole manufacturing industry is plagued by this problem,it limits the practical application and spread of the technology.The Stereo Lithography Additive Manufacturing is the most widely used stereo lithography process,supporting process parts model will greatly influence the production of precision and machining cost model,and even directly related to the success of model making In this paper,we have made a detailed study concerning the effects of the various shapes on the linked island area in the rapid prototyping.It can supply the theoretical basis for the determination of adding support or not,thus it can improve the production efficiency and accuracy of work which ensure the fabrication runs smoothly.This thesis mainly covers the following aspects:(1)Analysis the numerical relationship between the wall thickness and the error in case of constant internal diameter for the unsupported circular surface;the numerical relationship between the inner diameter and the error in case of constant wall thickness;(2)Analysis the numerical relationship between the length of the unsupported cantilever and the magnitude of error in case of cantilever;(3)Analysis the numerical relationship between the inclination angle and the magnitude of error in case of cantilever.Through experiments and research,the results show:during stereo lithography additive manufacturing process,the deformation of the round linked island area is determined by the values of wall thickness and inner diameter,increasing the wall thickness or reducing the inner diameter can reduce the deformation of the round linked island area,when the internal diameter is less than or equal to 24 mm or the wall thickness is bigger than or equal to 3 mm,the deformation of the model is basically around 0.02 mm;the deformation of the cantilever linked island area is determined by the length of the extension,model wall thickness and cantilever thickness have no effect on deformation,when the length of the extension is less than or equal to 3.5mm,and the cantilever length of the bilateral linked island area is less than or equal to 7 mm,the deformation of the cantilevered island area almost unchanged;the deformation of the inclined linked island area is determined by the value of the angle and the extension length,increasing the tilt angle or reducing the extension length can reduce the deformation of the inclined linked island area,when the inclination angle of the model is 100 degrees,the maximum extension length can be made to be 4 mm,when the inclination angle of the model is 110 degrees,the maximum extension length can be made to be 8 mm,when the inclination angle of the model is 120 degrees,the maximum extension length can be made to be 10 mm,when the inclination angle of the model is 130 degrees,the maximum extension length can be made to be 14 mm,when the inclination angle of the model is 135 degrees,the extension length has no effect on the deformation.